I would keep asking the doctors for help. If you don't ask you won't get anywhere. Sounds like you need more tests. I'm not a doctor but it could be Lyme disease and it's coinfections can cause all those symptoms and more, plus…the spirochetes hate heat…the lyme disease and coinfection tests that regular doctors do are outdated and inaccurate like the Elisa and the Western Blot. You don't have to be bitten by a tick, it could be a spider, mosquito or other biting fly etc…It will affect you when your immune system is low. If you exhausted all your other tests with no results then maybe see a Lyme Specialist. I know two things for me that were specific for Lyme was when I ate sugar or carbs I would be in overall body pain the next day and when I was put on an antibiotic for something else like a sinus infection I would get better but my symptoms would return if I got stressed or especially if I ate sugar, dairy, wheat. I have a Tarlov Cyst in my sacrum that affects my bladder. Lyme and it's coinfections will attack the parts of the body that are weak.